Submission #1323100

#	Time	Username	Problem	Language	Result	Execution time	Memory
1323100		yessimkhan	PIN (CEOI10_pin)	C++20	30 / 100	327 ms	14616 KiB

pin

#include <bits/stdc++.h>
// solved by bekagg
#define ll long long
#define ent '\n'
#define pb push_back
#define all(x) x.begin(),x.end()
#define PRaim_bek_abi ios_base::sync_with_stdio(0);cin.tie(0);

using namespace std;

const int N = 1e5+5;
const int MOD = 1e9+7;

int n , d;
ll ans;
map<string , int>mp;

void arkanefury228(){
    cin >> n >> d;

    for (int i = 1; i <= n; i++){
        string s;
        cin >> s;

        for (int mask = 0; mask < 16; mask++){
            string g = "";
            int sum = 0 , cnt = 0;
            for (int j = 0; j < 4; j++){
                if (mask & (1 << j)) g += s[j];
                else {
                    g += 'X';
                    cnt++;
                }
            }
            
            if (cnt == d){
                ans += mp[g];
            }
            else if (cnt < d) {
                ans -= mp[g];
            }
        }

        for (int mask = 0; mask < 16; mask++){
            string g = "";
            for (int j = 0; j < 4; j++){
                if (mask & (1 << j)) g += s[j];
                else g += 'X';
            }
            mp[g]++;
        }
    }

    cout << ans;
}

signed main(){

    PRaim_bek_abi

    int t=1;
    //cin>>t;
    for (int respagold = 1; respagold <= t; respagold++) arkanefury228();
}

• Subtask 1: 30 / 100